Step 2: We have a formula for calculating the average slope of a function that is: A = (f(x) âf(a)) /(x â a), 'A' represents the average slope. Here (x-a) is used to represent the change in input values and f(x) â f(a) is used to denote the change in output of the function f(x).
This value is expressed in hours and represents the number of hours before the lamp is at half its original brightness. The expected life of a lamp will vary based on the lamp technology and the projector; however, most projectors offer about 2000 hours. The lamp's success rate is based on a bell curve, so that a majority of (but not all) lamps will meet the lamp life hours specified.
Philips and Osram are two of the most dependable brands, and you don't want to buy a remanufactured lamp. While the older DLP lamps last between 1,000 and 2,000 hours, the newer ones can give you 6,000 to 7,000 hours worth of TV viewing.